MSI cx623 -- Ubuntu 11.04 - Graphics freez

[Pop Horea]

Hi,
I have a laptop with video card MSI cx623 310M 1GB DDR3 NVIDIA.
Graphics locks throughout the system and force me to give restart with CTRL + F1 thenCTRL + LA + DEL. What to do?

I have bumblebee with nouveau (enabled) installed.
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